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73533 Zip Code (Duncan, OK) Detailed Profile. Cities: Duncan, OK (10.67%), Central High, OK (4.77%), Empire City, OK (2.28%), Bray, OK (1.08%), Marlow, OK (0.00%), Velma, OK (0.00%) Counties: Stephens County, OK (98.70%), Cotton County, OK (1.30%)
Duncan is a city and county seat of Stephens County, Oklahoma, United States. The population was 23,431 at the 2010 census. The Chisholm Trail Crossing through Duncan's US-81